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Window.showModalDialog() NOW deprecated..

Deprecated
This feature has been removed from the Web standards. Though some browsers may still support it, it is in the process of being dropped. Do not use it in old or new projects. Pages or Web apps using it may break at any time.

Mozilla has announced that it will remove support for this method (bug 981796). Regarding timing, it shouldn’t be before Firefox 39. This means that the function will be around until around mid-June 2015. It also means that for enterprise you can switch to using ESR 38 builds, which will have the function into mid 2016.